Issue #1852454 by patrickd, xjm, YesCT, Berdir, amateescu, Pancho, djroshi, dealancer, Wim Leers, jessebeach: Restrict module and theme name lengths to 50 characters.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1933548 by alexpott: Fixed Book allowed_types() settings repetitive and in under certain conditions can change unexpectedly.

Issue #1821420 by vijaycs85, cam8001, Albert Volkman, ACF, typhonius, pcambra, Berdir: Convert mail variables to cmi.

Issue #1928082 by vijaycs85, YesCT, alexpott: Fixed Make usage of book.settings:allowed_types() consistent.

Issue #1798734 by Berdir, ACF, leschekfm, heyrocker, alexpott: Convert drupal_private_key() to the configuration system.

Issue #1804380 by miro_dietiker, vijaycs85, 8thom, swentel: Convert color variables to config/state.

Issue #1779026 by dagmar, tim.plunkett, sun, heyrocker: Convert Text Formats to Configuration System.

Issue #1852966 by yched, Stalski, zuuperman, swentel: Rework entity display settings around EntityDisplay config entity.

Revert "Issue #1852966 by yched, swentel: Rework entity display settings around EntityDisplay config entity."

This reverts commit 8ad67af2.

Issue #1852966 by yched, swentel: Rework entity display settings around EntityDisplay config entity.

Issue #1813184 by brandenlhamilton, Lars Toomre, ACF, Berdir: Convert variable 'tracker_index_nid()' to state system.

Issue #1860778 by plach, tayzlor, Berdir, cosmicdreams: Fixed Provide an upgrade path for date formats.

Issue #1799218 by ACF, Albert Volkman, anenkov, penyaskito, znerol, LinL: Convert taxonomy_override_selector() and taxonomy_terms_per_page_admin() variables to use configuration system.

Issue #347988 by sun, Berdir, dawehner, Damien Tournoud, moshe weitzman: Move $user->data into own table.

Issue #1292470 by sun, tim.plunkett, Berdir, moshe weitzman, pcambra, Niklas Fiekas, andypost et al: Convert user pictures to Image Field.

Issue #1790920 by alexpott, japicoder, LinL, heyrocker: Move cron_last(), node_cron_last() and common_test_cron() to state system.

Issue #1798804 by Albert Volkman, tayzlor, alexpott: Convert node_access_needs_rebuild() to state system .

Issue #1810880 by Albert Volkman, vijaycs85, barbun, alexpott: Convert update_last_check() and update_last_email_notification() variables to CMI system.

Revert "Issue #1798732 by Dean Reilly, westie, alexpott, sun: convert install_task() variable to use state system."

This reverts commit d3edf501.

This caused unexpected errors with installation on sites with existing
settigs.php files. Rolling back until keyvalue store is available during
installation.

Issue #1798732 by Dean Reilly, westie, alexpott, sun: convert install_task() variable to use state system.

Issue #1464554 by aspilicious, jhedstrom, sun, alexpott, disasm | heyrocker: Upgrade path for image style configuration.

Issue #1789606 by sun, alexpott: Fixed Upgrade path tests for all system module variables converted to CMI so far.

Issue #1460764 by klausi: Missing test coverage for a D7 install with non-required modules installed but disabled.